I want to be able to change the way a move moves a character, and I just don't know where to start. For example, I want Ganondorf's aerial Side-B to move him at a upward angle (similar to Wolf's Side-B).

Do I have to edit the fitmotion.pac file to do this? And can I do this with PSA, or do I have to use BrawlBox (I ask because I don't have much experience with BrawlBox)?

I don't have much experience with things like this, so if anyone can give me some tips on where to start, that would be great.

Not really, it's kinda complicated to explain without a video or audio, and I haven't yet gotten to making this particular video yet; would maybe an alternate method of communication work for you? I can also do TeamSpeak, Discord, or Google Duo